[wasm] Implement frame inspection for interpreted frames

src/debug/debug.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/debug/debug.h"
 
 #include <memory>
 
 #include "src/api.h"
 #include "src/arguments.h"
@@ skipping 42 matching lines @@
       break_on_exception_(false),
       break_on_uncaught_exception_(false),
       side_effect_check_failed_(false),
       debug_info_list_(NULL),
       feature_tracker_(isolate),
       isolate_(isolate) {
   ThreadInit();
 }
 
 BreakLocation BreakLocation::FromFrame(StandardFrame* frame) {
-  // TODO(clemensh): Handle Wasm frames.
-  DCHECK(!frame->is_wasm());
+  if (frame->is_wasm()) {
+    WasmInterpreterEntryFrame* wasm_frame =
+        WasmInterpreterEntryFrame::cast(frame);
+    return wasm_frame->wasm_instance()->compiled_module()->GetBreakLocation(
+        wasm_frame->position());
+  }
 
   auto summary = FrameSummary::GetFirst(frame).AsJavaScript();
   int offset = summary.code_offset();
   Handle<AbstractCode> abstract_code = summary.abstract_code();
   if (abstract_code->IsCode()) offset = offset - 1;
   Handle<DebugInfo> debug_info(summary.function()->shared()->GetDebugInfo());
   auto it = BreakIterator::GetIterator(debug_info, abstract_code);
   it->SkipTo(BreakIndexFromCodeOffset(debug_info, abstract_code, offset));
   return it->GetBreakLocation();
 }
@@ skipping 2248 matching lines @@
 
   // Store the previous break id, frame id and return value.
   break_id_ = debug_->break_id();
   break_frame_id_ = debug_->break_frame_id();
   return_value_ = debug_->return_value();
 
   // Create the new break info. If there is no proper frames there is no break
   // frame id.
   StackTraceFrameIterator it(isolate());
   bool has_frames = !it.done();
-  // We don't currently support breaking inside wasm framess.
-  DCHECK(!has_frames || !it.is_wasm());
   debug_->thread_local_.break_frame_id_ =
       has_frames ? it.frame()->id() : StackFrame::NO_ID;
   debug_->SetNextBreakId();
 
   debug_->UpdateState();
   // Make sure that debugger is loaded and enter the debugger context.
   // The previous context is kept in save_.
   failed_ = !debug_->is_loaded();
   if (!failed_) isolate()->set_context(*debug->debug_context());
 }
@@ skipping 289 matching lines @@
   logger_->DebugEvent("Put", message.text());
 }
 
 void LockingCommandMessageQueue::Clear() {
   base::LockGuard<base::Mutex> lock_guard(&mutex_);
   queue_.Clear();
 }
 
 }  // namespace internal
 }  // namespace v8